We don't have enough money for a cat tree, so my boyfriend made him a box fort. : r/cats
This is what you do whem you have a ton of boxes hanging around... Build an epic box fort for your cats. | Cat house diy, Pet bunny rabbits, Cardboard cat house
People Are Building Cardboard Tanks for Their Cat Friends Amid Quarantine
Blinging Out a Cardboard Cat Fort : 5 Steps (with Pictures) - Instructables
Man Builds Amazing Cat Creations From Cardboard | PetGuide
Amazon.com : PawHut Cardboard Cat House DIY Cat Tree with Condos, Scratching Pad Board Hideaway Toy Pet Furniture, Brown : Pet Supplies